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Date:   Thu, 14 Feb 2019 19:19:29 -0800
From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
To:     "Joel Fernandes (Google)" <joel@joelfernandes.org>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>, ast@kernel.org,
        atishp04@gmail.com, dancol@google.com,
        Dan Williams <dan.j.williams@intel.com>,
        gregkh@linuxfoundation.org, Jonathan Corbet <corbet@lwn.net>,
        karim.yaghmour@opersys.com, Kees Cook <keescook@chromium.org>,
        kernel-team@android.com, linux-doc@vger.kernel.org,
        linux-kselftest@vger.kernel.org,
        Manoj Rao <linux@manojrajarao.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        paulmck@linux.vnet.ibm.com,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        rdunlap@infradead.org, rostedt@goodmis.org,
        Shuah Khan <shuah@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, yhs@fb.com
Subject: Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to
 extend the kernel
Message-ID: <20190215031926.ljzluy2cfxp64u6o@ast-mbp>
References: <20190211143600.15021-1-joel@joelfernandes.org>
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On Mon, Feb 11, 2019 at 09:35:59AM -0500, Joel Fernandes (Google) wrote:
> Introduce in-kernel headers and other artifacts which are made available
> as an archive through proc (/proc/kheaders.txz file). This archive makes
> it possible to build kernel modules, run eBPF programs, and other
> tracing programs that need to extend the kernel for tracing purposes
> without any dependency on the file system having headers and build
> artifacts.
> 
> On Android and embedded systems, it is common to switch kernels but not
> have kernel headers available on the file system. Raw kernel headers
> also cannot be copied into the filesystem like they can be on other
> distros, due to licensing and other issues. There's no linux-headers
> package on Android. Further once a different kernel is booted, any
> headers stored on the file system will no longer be useful. By storing
> the headers as a compressed archive within the kernel, we can avoid these
> issues that have been a hindrance for a long time.

The set looks good to me and since the main use case is building bpf progs
I can route it via bpf-next tree if there are no objections.
Masahiro, could you please ack it?